No. it happen because of the derivatives of sin and cos function
f only reappears since taking the derivative twice of sin/cos will give you sin/cos again.
No, it happens only because it is a sin and cos function (whose second derivatives are -sin or -cos)
No, this only happens here because sin and cos have derivatives that loop
No it's just bc the properties of the derivatives of sin/cos
No. it happen because of the derivatives of sin and cos function
f only reappears since taking the derivative twice of sin/cos will give you sin/cos again.
No, it happens only because it is a sin and cos function (whose second derivatives are -sin or -cos)
No, this only happens here because sin and cos have derivatives that loop
No it's just bc the properties of the derivatives of sin/cos